11981053764 has 63 divisors (see below), whose sum is σ = 31451401807. Its totient is φ = 3991714344.

The previous prime is 11981053759. The next prime is 11981053769. The reversal of 11981053764 is 46735018911.

The square root of 11981053764 is 109458.

It is a perfect power (a square), and thus also a powerful number.

11981053764 is a `hidden beast` number, since 11 + 98 + 10 + 537 + 6 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (11981053759) and next prime (11981053769).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11981053769) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 5909719 + ... + 5911745.

Almost surely, 2^11981053764 is an apocalyptic number.

11981053764 is the 109458-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11981053764

11981053764 is an abundant number, since it is smaller than the sum of its proper divisors (19470348043).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11981053764 is an frugal number, since it uses more digits than its factorization.

11981053764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4076 (or 2032 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 11981053764 in words is "eleven billion, nine hundred eighty-one million, fifty-three thousand, seven hundred sixty-four".